A Tour of Company Sites

Early Anita Desktop Calculators

Anita Mk 9


The ANITA Mk 9 is similar to the ANITA Mk 8, but with additionally the capability of chain multiplication, e.g. "a" times "b" times "c" times "d" and so on. Again it has the full keyboard

The electronics is also similar to that of the ANITA Mk 8, and uses a Dekatron decade counter tube, cold-cathode switching tubes, selenium rectifiers, and vacuum tubes (thermionic valves).

Introduced 1964[1].

There is an operating manual for this machine in the Operating Manuals & Leaflets section.

Keys & display

Close up of the keys and display.


The keyboard, on the right has been hinged completely over to reveal the electronics inside the machine. On the left are the red-coloured numerical display tubes, each mounted on the edge of a counter board. The Dekatron counter tube is in the lower middle of the photograph.

Circuit board

The Dekatron tube is at the lower right, driven by a vacuum tube, used as a blocking oscillator, to its left. Two vertical daughter boards to the left carry cold-cathode trigger tubes and selenium rectifiers. Further black, rectangular, selenium rectifiers can be seen around the Dekatron

Inside rear

Inside the rear of the machine with the power supply and more vacuum tubes. These are mounted right at the back of the main board, underneath vents when the casing is replaced, to provide an outlet for the heat generated.


  1. "Lamson Industries Limited", The Times, 2nd April 1965.


If you have information about the development of Anita calculators, or know of somebody who worked there, please get in touch with me.

Origins of Bell Punch Co.
Mechanical Calculator Days
National Calculating Service
Development of Anita 1
Development of Anita 2
Anita is Launched
At work with Anita
All Change at Bell Punch
Anita Developed Further
Anita at its Zenith
The Rockwell Connection
Demise of Anita & Bell Punch
Mechanical Calculators
Early Anita Desktop Calculators
Transistors & Integrated Circuits
Anita LSI Desk Calculators
Anita Hand-held Calculators
Rockwell-Anita Calculators
Calculators made by others
Advertisements & Brochures
Operating Manuals & Materials
Company Information
A Tour of Company Sites
The Technology Explained
Operating a Comptometer
Old Sterling Currency, £sd
Update Information
Getting in touch

Early Anita Desktop Calculators

Mk 8
Mk 9
Mk 10
Mk 11
Mk 12
Transistorised memory Unit

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Text & photographs copyright © 2002 - 2009 Nigel Tout, except where noted otherwise.